abc's jon karl explains. >> reporter: we took a journey to the u.s. mint in philadelphia for a lesson in how the government is losing money by making money. this is the presidential dollar coin. congress ordered the mint to make millions of them to honor every dead president but nobody seems to want them. they cost 32 cents a pop to make. the mint makes nearly 2 million of them every day. do the math. about 600,000 dollars a day to make them. because almost nobody uses these things, most go directly into storage. we found a bunch of them 100 miles down the road in a vault. here at the federal reserve in baltimore, the coins are packed into plastic bags stacked one on top of each other all the way up and down this aisle several aisles of them, millions and millions of dollars in presidential coins. federal reserve says they are piling up so quickly they are spending $650,000 to build a new vault in dallas to hold them. shipping the coins there will cost another $3 million. senator jack reed was one of the co-sponsors of the bill that directed the mint